最近在學(xué)習(xí)Java AIO操作時(shí)，出現(xiàn)如下異常

比較奇怪的是，該異常僅僅在兩個(gè)操作間隔非常短的時(shí)候，才會(huì)出現(xiàn)。根據(jù)調(diào)式與排查，發(fā)現(xiàn)問(wèn)題出現(xiàn)在AsynchronousSocketChannel的connect方法調(diào)用上。

/*** Connects this channel.** <p> This method initiates an operation to connect this channel. This* method behaves in exactly the same manner as the {@link* #connect(SocketAddress, Object, CompletionHandler)} method except that* instead of specifying a completion handler, this method returns a {@code* Future} representing the pending result. The {@code Future}'s {@link* Future#get() get} method returns {@code null} on successful completion.** @param remote* The remote address to which this channel is to be connected** @return A {@code Future} object representing the pending result** @throws UnresolvedAddressException* If the given remote address is not fully resolved* @throws UnsupportedAddressTypeException* If the type of the given remote address is not supported* @throws AlreadyConnectedException* If this channel is already connected* @throws ConnectionPendingException* If a connection operation is already in progress on this channel* @throws SecurityException* If a security manager has been installed* and it does not permit access to the given remote endpoint*/public abstract Future<Void> connect(SocketAddress remote);

此處connect為異步方法，調(diào)用connect時(shí)，可能并沒有成功建立連接，從而導(dǎo)致出現(xiàn)上述異常。
解決措施：
1、顯示調(diào)用get，通過(guò)阻塞的方式，獲取連接。

2、通過(guò)如下connect方法，通過(guò)第三個(gè)參數(shù)，在完成連接連接時(shí)，進(jìn)行后續(xù)操作。

public abstract <A> void connect(SocketAddress remote,A attachment,CompletionHandler<Void,? super A> handler);

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